bisecting cause commit starting from e5220dd16778fe21d234a64e36cf50b54110025f building syzkaller on 500c23397f34dde583da6d31f9d9fd21cae289f8 testing commit e5220dd16778fe21d234a64e36cf50b54110025f with gcc (GCC) 10.2.1 20210217 kernel signature: 8b28291962862615e422b43b8c0d35884f2b47f9838abf68bcf1d121bcd8449b all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.12 testing commit 9f4ad9e425a1d3b6a34617b8ea226d56a119a717 with gcc (GCC) 10.2.1 20210217 kernel signature: 20a3195b0c2adea39c30d2e9f830a6fa425a34f031f28cd84a5fc4bf09ce8f4d all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.11 testing commit f40ddce88593482919761f74910f42f4b84c004b with gcc (GCC) 10.2.1 20210217 kernel signature: 22b26ae1e3be417e2ad324e47433a262e845b6471dfc09f4fa2f647b3330df8e all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.10 testing commit 2c85ebc57b3e1817b6ce1a6b703928e113a90442 with gcc (GCC) 10.2.1 20210217 kernel signature: 8f55ba93fd53951cac9b68b979c728becbef461543abacbe99727324ff41baf6 all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.9 testing commit bbf5c979011a099af5dc76498918ed7df445635b with gcc (GCC) 10.2.1 20210217 kernel signature: f654d07eeb7c456b884d4afbd5bc4d393d1b1677ed42327eee0eaef482a1d4de all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.8 testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.4.1 20210217 kernel signature: 1063ebaf54671db7804acf12269942e9a5933d00bfb78bb5cf898a218f3c1d07 all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.4.1 20210217 kernel signature: 3856a09b3d94850025e3ae49dd0f33b972955333e09df445983a6a278d85997d all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.4.1 20210217 kernel signature: a3b93acd1315ac27fd28df3f64d6ec371b03ab2c3dca6caf01eeb51039157802 all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.4.1 20210217 kernel signature: 56b75590080ebce41771eb20fb3a18a21250479d609f5cd866a9e9cf93705477 all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.4.1 20210217 kernel signature: c6858008ba2dd87e1e0dfa3f7b77c43b09b0dc43a2a0142524db4f19e9503c6e all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.4.1 20210217 kernel signature: aae18b99c108d4b86fb7c39080c3a8373862416e546d19d54d8a47dcb2701455 all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.4.1 20210217 kernel signature: e13f671b39135f0fd02c29412f7240f2d07a062c4a49e605a3f48631956d18cb all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.4.1 20210217 kernel signature: 1e42e1e588ea7d5fe6accbe13bfa4221a4f9f3d4fb725780ca1567cc27b907dc all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.4.1 20210217 kernel signature: 456ab9d42a47fc3d91f08b7c50f5c4ec701f7eb218a74b092e90c30f2478d7da all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.4.1 20210217 kernel signature: 52be5f73449d505bb44d0a5f72d2edca5f0a41445b2041ccd2bb87bef17bd097 all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.4.1 20210217 kernel signature: f1aef89a33e34b247f733bb9f421cd27a3ee518b8c8fb349d31077e1afc7c283 all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.4.1 20210217 kernel signature: 96b5f09207a91480a2251365659759d93587b0906af20c7844c9d3573ba287d7 all runs: crashed: KASAN: use-after-free Read in snd_seq_timer_interrupt testing release v4.17 testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.4.1 20210217 failed to run ["make" "-j" "64" "ARCH=x86_64" "CC=/syzkaller/shared/bisect_bin/gcc-8.1.0/bin/gcc" "bzImage"]: exit status 2 testing release v4.16 testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.4.1 20210217 orc_dump.c:106:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] orc_dump.c:111:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] elf.c:135:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] elf.c:140:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] testing release v4.15 testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.4.1 20210217 orc_dump.c:106:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] orc_dump.c:111:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] elf.c:135:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] elf.c:140:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] pager.c:36:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict] testing release v4.14 testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.4.1 20210217 orc_dump.c:105:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] orc_dump.c:110:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] pager.c:36:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict] elf.c:134:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] elf.c:139:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] testing release v4.13 testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.4.1 20210217 pager.c:35:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict] elf.c:144:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] elf.c:149:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] testing release v4.12 testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.4.1 20210217 pager.c:35:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict] elf.c:141:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] elf.c:146:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] testing release v4.11 testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.5.0 elf.c:141:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] elf.c:146:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] pager.c:35:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict] testing release v4.10 testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0 tools/include/linux/log2.h:19:1: error: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Werror=attributes] elf.c:129:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] elf.c:134:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] pager.c:35:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict] testing release v4.9 testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0 tools/include/linux/log2.h:19:1: error: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Werror=attributes] elf.c:129:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] elf.c:134:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] pager.c:35:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict] testing release v4.8 testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0 tools/include/linux/log2.h:19:1: error: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Werror=attributes] elf.c:129:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] elf.c:134:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] pager.c:33:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict] testing release v4.7 testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0 tools/include/linux/log2.h:19:1: error: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Werror=attributes] elf.c:122:2: error: 'elf_getshnum' is deprecated [-Werror=deprecated-declarations] elf.c:127:2: error: 'elf_getshstrndx' is deprecated [-Werror=deprecated-declarations] pager.c:33:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict] testing release v4.6 testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0 tools/include/linux/log2.h:19:1: error: ignoring attribute 'noreturn' because it conflicts with attribute 'const' [-Werror=attributes] pager.c:33:12: error: passing argument 2 to 'restrict'-qualified parameter aliases with argument 4 [-Werror=restrict] revisions tested: 17, total time: 2h59m51.886321648s (build: 2h2m24.616244423s, test: 52m0.420593004s) the crash already happened on the oldest tested release commit msg: Linux 4.18 crash: KASAN: use-after-free Read in snd_seq_timer_interrupt Bluetooth: hci3: command 0x0419 tx timeout Bluetooth: hci4: command 0x0419 tx timeout Bluetooth: hci1: command 0x0419 tx timeout Bluetooth: hci0: command 0x0419 tx timeout ================================================================== BUG: KASAN: use-after-free in snd_seq_timer_interrupt+0x2c8/0x370 sound/core/seq/seq_timer.c:145 Read of size 8 at addr ffff8800a9d99bd8 by task syz-executor.5/8554 CPU: 0 PID: 8554 Comm: syz-executor.5 Not tainted 4.18.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x15a/0x20d lib/dump_stack.c:113 print_address_description.cold.6+0x9/0x244 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold.7+0x242/0x305 mm/kasan/report.c:396 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 snd_seq_timer_interrupt+0x2c8/0x370 sound/core/seq/seq_timer.c:145 snd_timer_interrupt sound/core/timer.c:855 [inline] snd_timer_interrupt+0x617/0x1080 sound/core/timer.c:767 snd_timer_s_function+0xa7/0x120 sound/core/timer.c:1089 call_timer_fn+0x14d/0x590 kernel/time/timer.c:1326 expire_timers+0x268/0x3f0 kernel/time/timer.c:1363 __run_timers kernel/time/timer.c:1666 [inline] run_timer_softirq+0x1dc/0x530 kernel/time/timer.c:1692 __do_softirq+0x25c/0x986 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x17b/0x1c0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:527 [inline] smp_apic_timer_interrupt+0x12a/0x5b0 arch/x86/kernel/apic/apic.c:1055 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:compound_head include/linux/page-flags.h:142 [inline] RIP: 0010:virt_to_head_page include/linux/mm.h:659 [inline] RIP: 0010:check_heap_object mm/usercopy.c:232 [inline] RIP: 0010:__check_object_size mm/usercopy.c:259 [inline] RIP: 0010:__check_object_size+0xad/0x30c mm/usercopy.c:249 Code: fc ff df 48 c1 e8 0c 48 89 c2 48 b8 00 00 00 00 00 ea ff ff 48 c1 e2 06 48 01 c2 48 8d 42 08 48 89 c6 48 c1 ee 03 80 3c 0e 00 <0f> 85 db 01 00 00 48 8b 4a 08 f6 c1 01 0f 85 89 01 00 00 48 b9 00 RSP: 0018:ffff8800afcdfa68 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffea0002cf98c8 RBX: ffff8800b3e63c88 RCX: dffffc0000000000 RDX: ffffea0002cf98c0 RSI: 1ffffd400059f319 RDI: ffffffff8a4db309 RBP: ffff8800afcdfaa0 R08: 0000000000000008 R09: ffffffff8aeddd38 R10: ffff8800b083ebf0 R11: 0000000000000001 R12: 0000000000000004 R13: 0000000000000001 R14: ffff8800b3e63c8c R15: ffff8800b3e63c88 check_object_size include/linux/thread_info.h:119 [inline] check_copy_size include/linux/thread_info.h:150 [inline] copy_to_user include/linux/uaccess.h:154 [inline] xt_data_to_user+0x30/0x70 net/netfilter/x_tables.c:301 xt_target_to_user net/netfilter/x_tables.c:329 [inline] xt_target_to_user+0x142/0x1e0 net/netfilter/x_tables.c:325 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:879 [inline] get_entries net/ipv6/netfilter/ip6_tables.c:1044 [inline] do_ip6t_get_ctl+0x5e7/0x750 net/ipv6/netfilter/ip6_tables.c:1712 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x5f/0xc0 net/netfilter/nf_sockopt.c:122 ipv6_getsockopt net/ipv6/ipv6_sockglue.c:1382 [inline] ipv6_getsockopt+0x132/0x1c0 net/ipv6/ipv6_sockglue.c:1362 tcp_getsockopt net/ipv4/tcp.c:3550 [inline] tcp_getsockopt+0x6a/0xd0 net/ipv4/tcp.c:3544 sock_common_getsockopt+0x73/0xf0 net/core/sock.c:2999 __sys_getsockopt+0x12e/0x1f0 net/socket.c:1949 __do_sys_getsockopt net/socket.c:1960 [inline] __se_sys_getsockopt net/socket.c:1957 [inline] __x64_sys_getsockopt+0xb9/0x150 net/socket.c:1957 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x467bea Code: 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffec50492b8 EFLAGS: 00000212 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000029 RCX: 0000000000467bea RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 00007ffec50492e0 R08: 00007ffec50492dc R09: 0079746972756365 R10: 00007ffec5049340 R11: 0000000000000212 R12: 00007ffec5049340 R13: 0000000000000003 R14: 00007ffec50492dc R15: 00000000005438c0 Allocated by task 10352: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc.part.1+0x62/0xf0 mm/kasan/kasan.c:553 kasan_kmalloc+0xaf/0xc0 mm/kasan/kasan.c:538 kmem_cache_alloc_trace+0x142/0x350 mm/slub.c:2735 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] queue_new sound/core/seq/seq_queue.c:113 [inline] snd_seq_queue_alloc+0x52/0x4a0 sound/core/seq/seq_queue.c:195 snd_seq_ioctl_create_queue+0xaa/0x2e0 sound/core/seq/seq_clientmgr.c:1523 snd_seq_ioctl+0x1c6/0x3c0 sound/core/seq/seq_clientmgr.c:2145 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x196/0x1050 fs/ioctl.c:684 ksys_ioctl+0x62/0x90 fs/ioctl.c:701 __do_sys_ioctl fs/ioctl.c:708 [inline] __se_sys_ioctl fs/ioctl.c:706 [inline] __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:706 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 10346: save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x167/0x240 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 slab_free_hook mm/slub.c:1373 [inline] slab_free_freelist_hook mm/slub.c:1400 [inline] slab_free mm/slub.c:2955 [inline] kfree+0x130/0x3b0 mm/slub.c:3908 queue_delete+0x8b/0xa0 sound/core/seq/seq_queue.c:156 snd_seq_queue_client_leave+0x27/0x110 sound/core/seq/seq_queue.c:594 seq_free_client1.part.8+0xef/0x260 sound/core/seq/seq_clientmgr.c:263 seq_free_client1 sound/core/seq/seq_clientmgr.c:256 [inline] seq_free_client+0x5c/0xd0 sound/core/seq/seq_clientmgr.c:285 snd_seq_release+0x48/0xe0 sound/core/seq/seq_clientmgr.c:367 __fput+0x232/0x780 fs/file_table.c:209 ____fput+0x9/0x10 fs/file_table.c:243 task_work_run+0x111/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x180/0x1e0 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x47a/0x540 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8800a9d99b80 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 88 bytes inside of 512-byte region [ffff8800a9d99b80, ffff8800a9d99d80) The buggy address belongs to the page: page:ffffea0002a76600 count:1 mapcount:0 mapping:ffff8800b6002c00 index:0xffff8800a9d99180 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffffea0002cf5e00 0000000300000003 ffff8800b6002c00 raw: ffff8800a9d99180 00000000800c000a 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page allocated via order 1, migratetype Unmovable, gfp_mask 0x152c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:1906 [inline] prep_new_page mm/page_alloc.c:1914 [inline] get_page_from_freelist+0x2f35/0x46b0 mm/page_alloc.c:3345 __alloc_pages_nodemask+0x39e/0x2780 mm/page_alloc.c:4369 alloc_pages_current+0xd6/0x1b0 mm/mempolicy.c:2093 alloc_pages include/linux/gfp.h:492 [inline] alloc_slab_page mm/slub.c:1440 [inline] allocate_slab mm/slub.c:1585 [inline] new_slab+0x4a9/0x850 mm/slub.c:1656 new_slab_objects mm/slub.c:2419 [inline] ___slab_alloc+0x609/0x940 mm/slub.c:2571 __slab_alloc.isra.22+0x78/0xe0 mm/slub.c:2611 slab_alloc_node mm/slub.c:2674 [inline] slab_alloc mm/slub.c:2716 [inline] kmem_cache_alloc_trace+0x295/0x350 mm/slub.c:2733 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] kernfs_fop_open+0x21d/0xc00 fs/kernfs/file.c:648 do_dentry_open+0x3da/0xd50 fs/open.c:794 vfs_open+0xfc/0x240 fs/open.c:908 do_last fs/namei.c:3399 [inline] path_openat+0x919/0x2290 fs/namei.c:3540 do_filp_open+0x177/0x250 fs/namei.c:3574 do_sys_open+0x1dc/0x360 fs/open.c:1101 __do_sys_open fs/open.c:1119 [inline] __se_sys_open fs/open.c:1114 [inline] __x64_sys_open+0x79/0xb0 fs/open.c:1114 do_syscall_64+0xda/0x540 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Memory state around the buggy address: ffff8800a9d99a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8800a9d99b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8800a9d99b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8800a9d99c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8800a9d99c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================